Valentín Díaz was a Filipino

Filipino people

The Filipino people or Filipinos are an Austronesian ethnic group native to the islands of the Philippines. There are about 92 million Filipinos in the Philippines, and about 11 million living outside the Philippines ....

 patriot who was among the founders of the Katipunan

Katipunan

The Katipunan was a Philippine revolutionary society founded by anti-Spanish Filipinos in Manila in 1892, whose primary aim was to gain independence from Spain through revolution. The society was initiated by Filipino patriots Andrés Bonifacio, Teodoro Plata, Ladislao Diwa, and others on the night...

 that started the Philippine Revolution

Philippine Revolution

The Philippine Revolution , called the "Tagalog War" by the Spanish, was an armed military conflict between the people of the Philippines and the Spanish colonial authorities which resulted in the secession of the Philippine Islands from the Spanish Empire.The Philippine Revolution began in August...

 against Spain

Spain

Spain , officially the Kingdom of Spain languages]] under the European Charter for Regional or Minority Languages. In each of these, Spain's official name is as follows:;;;;;;), is a country and member state of the European Union located in southwestern Europe on the Iberian Peninsula...

 in 1896.

Díaz was born in Paoay, Ilocos Norte

Ilocos Norte

Ilocos Norte is a province of the Philippines located in the Ilocos Region in Luzon. Its capital is Laoag City and is located at the northwest corner of Luzon Island, bordering Cagayan and Apayao to the east, and Abra and Ilocos Sur to the south...

. He was a member of La Liga Filipina

La Liga Filipina

La Liga Filipina was a progressive organization created by Dr. José Rizal in the Philippines in a house at Ilaya Street, Tondo, Manila in 1892.The organization derived from La Solidaridad and the Propaganda movement...

, which José Rizal

José Rizal

José Protacio Rizal Mercado y Alonso Realonda , was a Filipino polymath, patriot and the most prominent advocate for reform in the Philippines during the Spanish colonial era. He is regarded as the foremost Filipino patriot and is listed as one of the national heroes of the Philippines by...

 founded to peacefully promote reforms in the Spanish colonial administration of the Philippines. Being a resident of Tondo in Manila

Manila

Manila is the capital of the Philippines. It is one of the sixteen cities forming Metro Manila.Manila is located on the eastern shores of Manila Bay and is bordered by Navotas and Caloocan to the north, Quezon City to the northeast, San Juan and Mandaluyong to the east, Makati on the southeast,...

, he joined the La Liga council that was headed by Andrés Bonifacio

Andres Bonifacio

Andrés Bonifacio y de Castro was a Filipino nationalist and revolutionary. He was a founder and later Supremo of the Katipunan movement which sought the independence of the Philippines from Spanish colonial rule and started the Philippine Revolution...

, who founded the Katipunan.

Díaz was one of the signatories of the Pact of Biak-na-Bato

Pact of Biak-na-Bato

The Pact of Biak-na-Bato, signed on December 14, 1897, created a truce between Spanish Colonial Governor-General Fernando Primo de Rivera and Emilio Aguinaldo to end the Philippine Revolution...

in 1897. He joined the revolutionaries exiled in Hong Kong as one of the conditions set forth by the Pact.